Downwload Music Videos, Mp3 In Youtube

If U use Firefox, U can Download This Addon For Converting Youtube to Mp3 Quickly
https://addons.mozilla.org/en-US/firefox/addon/11047

Or U can Use some websites to Convert Youtube to Mp3 :
http://www.youtubetomp3.net/
http://www.vidtomp3.com/
http://listentoyoutube.com/

Or U can Download Internet Download Manager, Install to Use Download Music Videos From After Using Some Converter Tools to Convert File .Flv (Downloaded From Youtube) to Mp3 Like:
Xilisoft Video Converter, Total video Converter,.... or U can play file .flv with some Flv Players like Allplayer : http://allplayer.org/en/download/

U can Find that Tools in My Website Down2.info.